Method of making heat-insulated receptacles.



R. HARTWIG. METHOD OF MAKING HEAT INSULATED REOEPTAOLES. APPLICATION I'ILYED JUNE 29, 1911.

1,029,364, Patented June 11,1912

UNITED STATES Pmm OFFICE. v

ROBERT HAR'PWIG, OF BERLIN, GERMANY, ASSIQNOR T0 THERMOS-AKTIENGESELL- SCHAFT, 0F BERLIN, GERMANY.

METHOD OF MAKING HEAT-INSULATED BECEPTACLES.

Patented June 11, 1912.

Application filed June 29, 1911. Serial Nh.'685,971.

To all whom it may concern:

Be it known that I, Ronnn'r Hsn'rwro, a subject of the-King of Prussia, residing at No. 12 Bregenzerstrasse, Berlin Kingdom of Prussia, Germany, have invented a new and useful Method of Making Heat-Insulated Receptacles.

Insulating receptacles have been known consisting of two vessels placed one in'the other so as to form a jacket-space which is filled with a bad heat-conducting material. For the purpose of preventing heat from being transferred from one vessel tothe other, an insulating ring or the like was placed between the two vessels at the place of transference, that is, near the upper edge. The receptacles were made eXclu-.

sively by furnishing an outer vessel formed with a bottom, with a bottom layer of an insulating material, placing the inner vessel upon this layer, filling the annular space between the sides of the two vessels with the insulating material, and then making the sealing joint comprising the insulating ring. That method was not very satisfactory because it was not easy to make the bottom layer perfectly smooth, and to arrange the inner vessel concentrically in the outer vessel. These difliculties would have been greater, and in fact insuperable, if it. had been desired to ram the insulating layer tightly because this would have been impos sible to eflect as regards the bottom layer according to that method. The great importance of ramming the insulating material on the insulating property of the vessel had not been appreciated, so that no attempt was made to improve on the loose arrangement of the material of the bottom layer.

The present invention has for its object to remedy those drawbacks by providing an improved method of making a heat insulated receptacle.

The improved method consists in using as the outer vessel a substantial cylindrical shell having no bottom, but being provided with an annular flange or the like. This shell is placed flange downward upon a .flat foundationand a jointing device such vessels. .The hollow space between the two vessels is then rammed tight up to the level of the bottom of the inner vessel with a finely divided insulating material, for instance, asbestos, glass wool, ground cork or the like. Then by means of a suitable device having a wedge-like action, the inner vessel is pressed with its flange upon the annular mass of insulating material, and this device is preferably so locked or fixed that it cannot get loose. Finally a layer of insulating material is spread upon the bottom of the inner vessel and rammed tight whereupon the bottom of the outer vessel is pressed down hard upon the said layer and is soldered or otherwise fastened in place.

One construction of receptacle according to this, invention is illustrated by way of example in the accompanying drawings, in which- Figure 1 is a substantially vertical cross section through a vessel made in accordance with my invention; Fig. 2 is a bottom plan view of the vessel, the bottom and loose material immediately adjacent thereto being removed; Fig. 3 is a vertical central section through the inner and outer shells and their flanges, together with the compression ring; Fig. 4 is a section similar to Fig. 3, but showing the loose material as filled in between the inner and outer shells during the making of the vessel; Fig. 5 is a section somewhat similar to Fig. 4, but showing the clamping mechanism as applied; Fig. 6

shows a further step than Fig. 5, to wit:

provided internally with a flange 6 adj went to one end and brackets 74 adjacent to its other end, the'outer shell having generally the form of an open ended cylinder. The inner shell is shown at c and is provided with a closed end e and with an open end opposite the closed end 6. vThe shell 0 is further provided with an annular flange (Z encircling its open end and spaced a little "distance therefrom. In. the manufacture of the receptacle the outer shell (1 is turned into such position that the flange b is downward, the shell resting upon a level base. The ring f of resilient material (in this instance rubber) is now laid upon the flange 6. Next the inner shell 0 is placed in the position indicated in Fig. 3, to wit, bottom upward, and with the flanged resting upon the rubber ring f. The flange (i now rests uniformly along the entire surface of the rubber ring f, and any pressure applied to the shell 0 has a tendency to be equalized by the ring f; yet there is nodirect metallic connection between the inner and outer shells. The substantially cylindrical vacant space between the shells is now filled in the usual or any desired manner, with an in-s sulating material in a finely divided form. For thls purpose asbestos, glass wool, orv

, powdered cork'may be employed. The material is filled into the space up to a level coinciding with the uppermost portion of the inner shell, the material being packed tightly in position and appearing generally as indicated in Fig.4. A fill is then placed directly upon the bottom e of the shell 0 and wedges l are driven between the fillet or strip 11 and the brackets I: as shown in Fig. 5. By this means the flange d of the shell 0 is forced upon the rubber ring f on the flange b of the shell a, thus sealing the joint between the shells.

Inprder to secure the wedges l in place a strip or fillet m is placed between opposite we es Z, the ends of the strip or fillet m preferably being forked, as shown, so as to partly embrace the wedges. The parts thus fitted in position, a layer .11 of the finely divided material is placed upon the bottom e of the shell 0, as shown in Fig. 6, and the disk It, with the annular .flange integral with it, is forced-down upon the material and secured in position by soldering rivets, or in any other desired manner, as shown in Fig. 7. With the receptacle thus formed I an outer vessel and havin preferably'employ a cover p provided with a filling of finely divided material q, similar to that'used between the shells. The cover is'provided with a handle 8 and rests upon a rubber ring 1' on the flange b of the shell a.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is k 1. The improved method of making a heat insulated receptacle comprising an inner and a bad heat-conducting 'material in the ja et-s ace between the two vessels, whichmeth consists in placingthe outer vessel being in the formof a shell without bottom and ha aninner flange flange-downward upon a su table sup port, inserting the inner vessel having a bottom and an outer flange. bottom u ward and concentrically into the outer vesse the outer flange of the inner vessel 1 inner flange of the outer vesse et or strip 2'.

above the I tight up the jacket-space between the tw vessels with insulating material, placing such material on the bottom of the inner vessel and fastening an outer bottom in the 'outer' shell, substantially as described.

2. The improved method of making aheat insulated receptacle comprising an inner and an outer vessel and having a bad heat-con ducting material in the jacket-space between the two vessels, which method consists in placing the outer vessel being in the form of a shell without bottom and having an inner flange flange-downward upon a suitable support, placing an elastic jointing device upon this flange, inserting the inner vessel having a, bottom and an outer flange bot tom upward and concentrically into the outer vessel, the flange of the inner 'vessel coming in uniform contact with the jointing device,

ramming tight up the jacket-space between the two vessels up to'the level of the'bottom of the inner vessel with insulating material,

compressing the jointing device between the two flanges by meansof a tensioning device,

spreading a layer of insulating material upon the bottom of the inner vessel, press-- ing an outer bottom down upon the said layer and fastening the saidbottom in the outer shell, substantially as described.

3. The improved method of making a heat insulated receptacle'comprising an inner and an outer vessel and hav ng a bad heat-conducting material in the jacket-space between the two vessels, which method consists in placing the outer vessel being in the form of a shell without bottom and having an inner flange flange-downward :upon a suit able supp'ort, @acing {S211 elastic jointing device upon this flange, inserting the inner vessel having a bottom and'an outer flange bottom u ward ,and concentrically into the outer v i coming in uniform contactwith the olntlng the flange of the inner vesseldevice, ramming-tight up-the, jacket-space between the two vessels up to the level of the bottom of the inner. vessel with insulating material, arrangi a tensloning devlce 'above the bottom of-t e .inner vessel, compressing the jointing device between the two flan es by tightenin up the tensioning device, the said evice in place, spreading a ayer of insulating material uponthe bottom of the inner vessel, pressmg an outer bottom down upon the said layer and fastening the said bottom in the -outer shell, substantially as described. In testimony whereof, I have signed my name to this s ification in the presence of two subscriblnglwitnesses.

, OBERT H A R'IIW IG,

Witnesses: .1

Wonnnm. Hnur'r, I Hun-ax Hnsrna. 

